| 摘要 |
The zoom lens includes a first lens unit being disposed closest to an object and having a positive optical power, and at least one subsequent lens unit being disposed closer to an image than the first lens unit. The first lens unit is moved toward the object during variation of magnification from a wide-angle end to a telephoto end. The first lens unit is constituted by at least three lenses including a positive meniscus lens being disposed closest to the image among the at least three lenses and having an image side concave surface, and a negative lens being disposed on an object side next to the positive meniscus lens. A condition of 1.55<Rpi/f1<2.90 is satisfied where Rpi represent a curvature radius of the image side concave surface of the positive meniscus lens, and f1 represents a focal length of the first lens unit. |
